Granted Patent
Utility
US 4,868,089 · App. 07/183,432
Positive image forming method
Inventors:
Tatsuhiko Kobayashi, Sohei Goto, Ken Okauchi
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Apr 13, 1988
Inventors
Tatsuhiko Kobayashi
Sohei Goto
Ken Okauchi
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.